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Related Experiment Videos

Quelling the red menace: haem capture by bacteria

B C Lee1

  • 1Department of Microbiology and Infectious Diseases, The University of Calgary, Alberta, Canada.

Molecular Microbiology
|November 1, 1995
PubMed
Summary

Bacteria utilize heme, a vital nutrient, for essential functions like oxygen transport and energy generation. Specialized protein receptors and TonB-dependent transport facilitate heme uptake across bacterial membranes, crucial for bacterial growth and survival.

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Area of Science:

  • Bacterial physiology and nutrient acquisition
  • Molecular microbiology
  • Iron metabolism in bacteria

Background:

  • Heme is an essential nutrient for bacteria, serving as a prosthetic group for proteins involved in oxygen transport, energy generation, and oxidation.
  • Heme's iron component can also act as a substrate for bacterial growth.
  • Due to its reactivity, heme requires protein association for safe transport across bacterial membranes.

Purpose of the Study:

  • To elucidate the mechanisms of heme uptake and transport in bacteria.
  • To describe the role of bacterial surface receptors and TonB-dependent systems in heme acquisition.
  • To present a model for the regulation of heme receptor expression.

Main Methods:

  • Review and integration of existing knowledge on bacterial heme uptake.

Related Experiment Videos

  • Discussion of bacterial surface receptors and their role in binding heme and heme-proteins.
  • Explanation of the TonB-dependent transport mechanism for outer membrane translocation.

    • Main Results:

    • Bacteria possess diverse surface receptors for binding heme and heme-proteins.
    • Heme transport across the outer membrane is mediated by TonB-dependent systems.
    • Receptor expression is likely regulated by multiple global regulators.

    Conclusions:

    • Bacterial heme acquisition involves specific surface receptors and a TonB-dependent pathway.
    • The regulation of heme uptake systems is complex and multifactorial.
    • A comprehensive model for bacterial heme uptake and transport is proposed.